Many young gay and bisexual men leave their hometowns and move to cities in search of greater social and sexual freedom. But the change in address often comes with of host of health problems. John Pachankis, associate professor at the Yale School of Public Health, and his research team conducted one of the most comprehensive studies to date on the migration of young gay and bisexual men and its physical and emotional health implications. They found that when these men moved from hometowns where homophobia and discrimination were present to New York City, they experienced mental health issues, substance abuse and engaged in HIV-risk behavior.